Foundry flask



Dec. 22, 1936. R SMITH 2,065,345@

FOUNDRY F'LASK Filed Jan. 26, 1935 l ....,.......W.,...,..... ......m,

ATTORNEY.

Z r ...H U i' Ww n j f@ BY Patented Dec. 22, 1936 UETED STATES OFFEQE FOUNDRY FLASK Application January 26, 1935, Serial No. 3,607

3 Claims.

This invention relates to improvements in foundry flasks.

In my former Patent #1,974,292, issued September 18, 1934, there is disclosed a foundry flask each section of which is formed of a plurality of elongated strips of rolled metal having a desired cross sectional shape, one of said strips having a longitudinally extending twist resisting rib, and said sections being joined together along longitudinal lines while positioned in such a manner as to maintain the rib substantially centrally of the height of the flask section, and then being bent to desired shape. The purpose of the rib is to provide a strong, compact reinforcement so that the ask section Will offer maximum resistance to torsional strains. One or both of the other elongated strips is provided on its outer longitudinal edge with a iiange and in foundry practice it is necessary to have these flanges extend in different directions, that is, either inwardly or outwardly, depending upon the type of work. It was an object of my former patent to provide a method of manufacturing ask sections Which made it possible, by carrying rolled strips of metal of a predetermined number of different cross-sectional shapes, to form ask sections of practically any desired height within a given range and of any required cross-sectional shape.

With the method described in the before-mentioned patent all of the differentV rolled strips of metal which it was necessary to stock were of special form and therefore had to be specially fashioned. The present invention contemplates a flask section formed by the method described in the before-mentioned patent wherein standard stock material is employed for part of each section in place of one of the specially designed strips.

A further object of the invention is to provide an improved foundry flask, each section of which is formed of a plurality of joined strips, wherein standard stock material is employed for one of the strips to provide a longitudinally extending twist resisting rib around the, flask section.

A more specific object of the present invention is to provide a foundry flask section as above described Wherein said standard stock material consists of an ordinary bar, either solid or tubular, of standard cross-sectional shape such as circular or rectangular.

A further object of the invention is to provide a foundry flask which is simple and economical in construction, strong and durable, and well adapted for the purpose described.

(Cl. 22u-96) With the above and other objects in view the invention consists of the improved foundry iiask and all its parts and combinations, as set forth in the claims, and all equivalents thereof.

In the accompanying drawing in which the same reference numerals designate the same parts in all of the views:

Fig. 1 is a perspective view showing three strips of metal assembled in proper relationship with one another prior to Welding of the strips together;

Fig. 2 is a similar view showing the three strips after they have been united;

Fig. 3 is a perspective View showing how one of the sections illustrated in Fig. 2 may be bent to form a flask section;

Fig. 4 is a plan view of a completed flask section with the adjacent ends joined together and fittings attached thereto;

Fig. 5 is a sectional view taken on line 5 5 of Fig. 4;

Fig. 6 is an enlarged cross-sectional View taken on line 6 6 of Fig. 2;

Fig. 7 is a view similar to Fig. 6 showing hoW a flask sectionof modified cross-sectional shape and dimension may be formed;

Fig. 8 is a similar View showing still another modification; and

Figs. 9 to 12 inclusive are sectional views showing different types of rolled metal stock which it is necessary to use in forming the improved flask.

In carrying out the improved method it is necessary to carry but four different types of special rolled metal strips. These strips may be originally furnished in lengths as desired and may then be cut to suit requirements. In Fig. 9 the narrowest edge strip I5 is illustrated, said strip being preferably one inch in width and having a right angularly extending flange I 6. In Fig. V10 a similar type of strip Il is illustrated, said strip, however, being preferably two inches in Width and having an identical iiange i6. Strips I8 and i9, illustrated in Figs. 1l and 12 respectively, are also provided with the flanges I6 and are preferably three inches and four inches in width, respectively.

Instead of utilizing a specially formed central strip adapted to have two of the edge strips ile lustrated in Figs. 9 to 12 inclusive joined thereto, it is an object of the present invention to provide a flask section in which the central strip may be formed of standard stock material While still being capable of being properly joined to the edge strips. Accordingly it is contemplated to utilize preferably a standard solid bar 20, circular in crossesection, as illustrated in Fig. 6. In said ligure two of the edge strips I9 are shown joined to said bar. Said joining is carried out by holding the strips I9 juxtaposed the bar 2U and by welding as at 2| in the recesses naturally formed by said juxtaposition. Thus a flask section may be formed, one side of which is relatively straight and regular and the other side of which has the major portion of the bar 2U projecting therefrom to form a relatively heavy, solid, twist resisting reinforcing rib entirely around the flask section. The flanges I6 may, of course, be originally positioned to extend in any desired direction.

In Fig. 7 is illustrated a modied construction wherein two of the strips I8 are suitably joined to a central bar 22 of standard construction which is square in cross-section. In View of the fact that natural welding recesses are not formed when utilizing the rectangular stock 22, it is desirable to form the lines of juncture by use of the well-known controlled carbon arc welding method, the welding being designated by the numeral 23.

In Fig. 8 still another modification is shown also permitting formation of the reinforcing rib by standard stock material wherein a standard metallic tube 24 is welded to two of the edge strips. In Fig. 8, in order to illustrate the variations possible, one of the strips il having its flange i6 extending in one direction, has been shown, and one of the strips i3 having its flange I6 extending in the opposite direction from the first-mentioned ilange.

In all of the constructions shown in Figs. 6, 7 and 8, it will be noted that the longitudinally extending twist resisting reinforcing rib is formed by standard stock material 25, 22 or 24. Thus to manufacture a flask having any required cross-sectional shape it is merely necessary to provide rolled metal of the four cross-sectional shapes shown in Figs. 9 to 12 inclusive, and standard bar stock 20, 22 or 24. IWith this material to start with, one or both of the ilanges may be caused to project outwardly as in Fig. 6, inwardly as in Fig. 7, or in different directions as in Fig. 8, and any desired height within a predetermined range may be obtained by combining two of the edge strips l5 with one of the bars 28 to obtain a flask section of minimum height, by combining two of the edge strips i9 with the bar 2i] to obtain a flask section of maximum height, or by combining the edge strips in other ways to produce sections of a desired height in between the minimum and maximum.

The welded-together strips shownv in Fig. 2 are bent either into half ilask sections or into full ilask sections as shown in Fig. 3. Next, the adjacent ends 25 are welded or otherwise secured together and the usual lugs 26 and trunnions 2? may be welded or otherwise secured in position as shown in Figs. 4 and 5. This results in a completed flask section having a centrally disposed longitudinally extending twist resisting rib 20, and having the ilanges I6 extending outwardly. Two of said sections may be superimposed as shown in Fig. 5, one section forming the cope 28 and the other section forming the drag 29 of a two-partflask.

In viewl of the fact that both of the flanges I6 extend outwardly, this type of flask is particularly suited for work wherein it is desired to have facility in insertion of the sand and ease of shake-out, and due to the use of the two upper and lower flanges, this type of section may be readily used for building up a plural section ask wherein the flanges form seats for the flask section above.

The flask section shown in Fig. '7 wherein both flanges extend inwardly is particularly suited for work wherein it is desired that the sand be retained in position in both directions. The type of ilask section shown in Fig. 8 is particularly suited for work wherein it is desired to have effective means for retaining the sand when the ilask section is right side up, while providing the outwardly extending flange at the top for ease of shake-out upon inversion.

It is obvious that the four special strips l5, il, I8 and i9 may be Varied somewhat in shape, the principal feature of the present invention residing in the combination with one or more of these special strips of standard bar stock 20, 22 and 2li, which standard bar stock may be of any other standard cross-section shape.

It is to be understood that all changes and modifications are contemplated as may come within the scope of the claims.

What I claim is:

1. A foundry ilask comprising an elongated central section of metal enlarged in cross section and of standard bar stock to constitute a relatively heavy, compact, twist resisting rib,

elongated sections of metal adjacent opposite longitudinal portions of said central section, and welding joining said adjacent longitudinal portions of the sections together, the welded-together sections being in a condition of having been bent to flask form.

2. A foundry flask comprising an elongated central section of metal enlarged in cross section and of standard bar stock, elongated sections of metal adjacent opposite longitudinal portions` of said central section, and welding joining said adjacent longitudinal portions of the sections together, the welded-together sections being in a condition of having been bent to ilask form, said sections being so positioned relative to one another that the enlarged central section projects from one side of the ilask only and forms a substantially ilush construction on the opposite side.

3. A foundry ilask comprising an elongated central section of metal enlarged and circular in cross section and of standard bar stock, elongated sections of metal adjacent opposite longitudinal portions of said central section, and Welding joining said adjacent longitudinal portions of the sections together, the welded-tw gether sections being in a condition of having been bent to flask form, said sections being so positioned relative to one another that the enlarged central section projects from one side ol the ilask only and forms a substantially flush construction on the opposite side with natural recesses due to the curvature of the bar in which the welding occurs.

IRVING R. SMITH. 

